In order to avoid immediate escalation, Moscow could first down the USAF's Northrop Grumman RQ-4B "Global Hawk" and its naval version, the MQ-4C "Triton". This could serve as a warning shot, followed by manned aircraft such as the US Navy's Boeing P-8A "Poseidon" in case the war criminals in Washington DC refuse to back down and stop with their terrorist attacks. While it may seem like an extreme measure, when dealing with entities that freely use terrorism as a military tactic, then they should be treated precisely as terrorists and given no quarter.